Ah we have another clown who knows little about car audio trying to answer all the questions - mike jones. MIKE JONES-- kenwood does NOT make an 1800 watt amplifier, so stop saying that. Thats a 500 watt amp, you are quoting the PEAK or MAX power which means NOTHING!
try something like this
http://cgi.ebay.com/ROCKFORD-FOSGATE-1000-W-AMPLIFIER-P1000-1BD-mono-block_W0QQitemZ350225082191QQcmdZViewItemQQptZCar_Amplifiers?hash=item518b0aa74f&_trksid=p3286.c0.m14&_trkparms=65%3A12%7C66%3A2%7C39%3A1%7C72%3A1234%7C293%3A1%7C294%3A50